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Monocyclic zwitterionic lambda(5)Si-silicates with an SiO(2)FC(2) framework: syntheses and structural

R Tacke1, R Bertermann, O Dannappel

  • 1Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. r.tacke@mail.uni-wuerzburg.de

Inorganic Chemistry
|May 15, 2001
PubMed
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New pentacoordinate silicate zwitterions were synthesized from acyclic precursors. Structural analysis revealed distorted trigonal bipyramidal geometries, with no silicon enantiomerization observed.

Area of Science:

  • Organosilicon Chemistry
  • Coordination Chemistry
  • Crystallography

Background:

  • Pentacoordinate silicon compounds exhibit unique reactivity and structures.
  • Zwitterionic silicates offer a platform for exploring novel chemical transformations.
  • Understanding the stereochemistry of silicon centers is crucial in inorganic chemistry.

Purpose of the Study:

  • To synthesize novel acyclic and monocyclic zwitterionic pentacoordinate silicates.
  • To elucidate the solid-state structures of these compounds using X-ray diffraction.
  • To investigate the solution behavior and stereochemical stability of silicon centers using NMR spectroscopy.

Main Methods:

  • Reaction of acyclic zwitterionic pentacoordinate silicates with silylating agents.

Related Experiment Videos

  • Single-crystal X-ray diffraction for structural determination.
  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, 19F, 29Si) including variable temperature studies.

    • Main Results:

    • Successful synthesis of monocyclic zwitterionic pentacoordinate silicates (11a-14a and 11b-14b).
    • X-ray diffraction confirmed distorted trigonal bipyramidal coordination geometries around silicon.
    • NMR data indicated the presence of chiral silicon centers existing as enantiomeric pairs, with no observed enantiomerization up to 85°C.

    Conclusions:

    • The synthesized monocyclic silicates adopt distorted trigonal bipyramidal structures.
    • Chiral silicon centers in these zwitterions are stereochemically stable under the studied conditions.
    • This work expands the library of pentacoordinate silicate structures and their stereochemical properties.